.TH "QwtTextEngine" 3 "Tue Nov 20 2012" "Version 5.2.3" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtTextEngine \- 
.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_text_engine\&.h>\fP
.PP
Inherited by \fBQwtMathMLTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtRichTextEngine\fP\&.
.SS "Public Member Functions"

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.RI "virtual \fB~QwtTextEngine\fP ()"
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.RI "virtual void \fBdraw\fP (QPainter *painter, const QRect &rect, int flags, const QString &text) const =0"
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.RI "virtual int \fBheightForWidth\fP (const QFont &font, int flags, const QString &text, int width) const =0"
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.RI "virtual bool \fBmightRender\fP (const QString &text) const =0"
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.RI "virtual void \fBtextMargins\fP (const QFont &font, const QString &text, int &left, int &right, int &top, int &bottom) const =0"
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.RI "virtual QSize \fBtextSize\fP (const QFont &font, int flags, const QString &text) const =0"
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.SS "Protected Member Functions"

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.RI "\fBQwtTextEngine\fP ()"
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.SH "Detailed Description"
.PP 
Abstract base class for rendering text strings\&. 

A text engine is responsible for rendering texts for a specific text format\&. They are used by \fBQwtText\fP to render a text\&.
.PP
\fBQwtPlainTextEngine\fP and \fBQwtRichTextEngine\fP are part of the Qwt library\&.
.PP
\fBQwtMathMLTextEngine\fP can be found in Qwt MathML extension, that needs the MathML renderer of the Qt solutions package\&. Unfortunately it is only available with a commercial Qt license\&.
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\fBSee also:\fP
.RS 4
\fBQwtText::setTextEngine()\fP 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "virtual void QwtTextEngine::draw (QPainter *painter, const QRect &rect, intflags, const QString &text) const\fC [pure virtual]\fP"
Draw the text in a clipping rectangle
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\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
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\fIrect\fP Clipping rectangle 
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\fIflags\fP Bitwise OR of the flags like in for QPainter::drawText 
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\fItext\fP Text to be rendered 
.RE
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.PP
Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
.SS "virtual int QwtTextEngine::heightForWidth (const QFont &font, intflags, const QString &text, intwidth) const\fC [pure virtual]\fP"
Find the height for a given width
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\fBParameters:\fP
.RS 4
\fIfont\fP Font of the text 
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\fIflags\fP Bitwise OR of the flags used like in QPainter::drawText 
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\fItext\fP Text to be rendered 
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\fIwidth\fP Width
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\fBReturns:\fP
.RS 4
Calculated height 
.RE
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.PP
Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
.SS "virtual bool QwtTextEngine::mightRender (const QString &text) const\fC [pure virtual]\fP"
Test if a string can be rendered by this text engine
.PP
\fBParameters:\fP
.RS 4
\fItext\fP Text to be tested 
.RE
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\fBReturns:\fP
.RS 4
true, if it can be rendered 
.RE
.PP

.PP
Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
.SS "virtual void QwtTextEngine::textMargins (const QFont &font, const QString &text, int &left, int &right, int &top, int &bottom) const\fC [pure virtual]\fP"
Return margins around the texts
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The textSize might include margins around the text, like QFontMetrics::descent\&. In situations where texts need to be aligend in detail, knowing these margins might improve the layout calculations\&.
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\fBParameters:\fP
.RS 4
\fIfont\fP Font of the text 
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\fItext\fP Text to be rendered 
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\fIleft\fP Return value for the left margin 
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\fIright\fP Return value for the right margin 
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\fItop\fP Return value for the top margin 
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\fIbottom\fP Return value for the bottom margin 
.RE
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.PP
Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
.SS "virtual QSize QwtTextEngine::textSize (const QFont &font, intflags, const QString &text) const\fC [pure virtual]\fP"
Returns the size, that is needed to render text
.PP
\fBParameters:\fP
.RS 4
\fIfont\fP Font of the text 
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\fIflags\fP Bitwise OR of the flags like in for QPainter::drawText 
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\fItext\fP Text to be rendered
.RE
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\fBReturns:\fP
.RS 4
Caluclated size 
.RE
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.PP
Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.

.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
